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Thanks Peter. I haven't finished reading the posts at that link but this from David Knisely supports what I see in the transmission graphs:
" From in-town, I found that the Deep-sky filter seemed to provide just
a hair more contrast than the GCE on the galaxies which I have been
testing it on so far. This would seem to support the initial conclusion
that the GCE is not as an effective "light pollution" filter as the
Deep-sky is."
I'd only need a modest boost to make galaxies worth looking at - at the moment I don't bother.
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